Mechanical pencil with self-tapping propelling nut and the method of producing same and propelling a lead contained therein
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United States of America Patent
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-
Mar 19, 1985
Grant Date -
N/A
app pub date -
Jun 21, 1982
filing date -
Jun 21, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A screw feed mechanical pencil having a propelling nut which self-taps on an unthreaded interior barrel wall. The pencil's barrel and split tube are plastic extrusions and a square lead is used to prevent lead rotation during writing.
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